yea im looking at a holley 750 hp right now converter is what it is cant afford one right now unfortunatelyYou were rolling right along until you said "off the shelf". There is only 1 cam that I know of "off the shelf" that is optimal for your combo. And, lucky for you, it is probably about perfect.
You will likely find it will like a 750 Holley HP a little better than that 650 and it will run better with more stall too. But with a 200 shot, you might want to stay around a 4000 RPM 9.5" unit.